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Copy pathtable.go
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128 lines (115 loc) · 2.56 KB
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package table
import (
"fmt"
"io"
"sort"
"strings"
)
type (
// Table represents a table of data to be rendered.
Table struct {
Columns []Column
Data []Row
Sort []int
ColumnSpacing string
}
// Row is a single row of data in a table.
Row = []string
// Column represents metadata about a column in a table.
Column struct {
Header string
Width int
// If false, render this column.
Hide bool
// If true, set the width to the widest value in this column.
Flexible bool
LeftAlign bool
}
)
const defaultColumnSpacing = " "
// NewTable creates a new table with the given columns and rows.
func NewTable(cols []Column, data []Row) Table {
return Table{
Columns: cols,
Data: data,
Sort: []int{},
ColumnSpacing: defaultColumnSpacing,
}
}
// NewColumn creates a new flexible column with the given name.
func NewColumn(header string) Column {
return Column{
Header: header,
Flexible: true,
Width: len(header),
}
}
// WithLeftAlign turns on the left align of this column and returns it.
func (c Column) WithLeftAlign() Column {
c.LeftAlign = true
return c
}
// Render writes the full table to the given Writer.
func (t *Table) Render(w io.Writer) {
columnWidths := t.columnWidths()
t.renderRow(w, t.headerRow(), columnWidths)
t.sort()
for _, row := range t.Data {
t.renderRow(w, row, columnWidths)
}
}
func (t *Table) columnWidths() []int {
widths := make([]int, len(t.Columns))
for c, col := range t.Columns {
width := col.Width
if col.Flexible {
for _, row := range t.Data {
if len(row[c]) > width {
width = len(row[c])
}
}
}
widths[c] = width
}
return widths
}
func (t *Table) sort() {
if len(t.Sort) == 0 {
return
}
sort.Slice(t.Data, func(i, j int) bool {
for _, sortCol := range t.Sort {
if t.Data[i][sortCol] < t.Data[j][sortCol] {
return true
} else if t.Data[i][sortCol] > t.Data[j][sortCol] {
return false
}
}
return false
})
}
func (t *Table) renderRow(w io.Writer, row Row, columnWidths []int) {
for c, col := range t.Columns {
if col.Hide {
continue
}
value := row[c]
if len(value) > columnWidths[c] {
value = value[:columnWidths[c]]
}
padding := strings.Repeat(" ", columnWidths[c]-len(value))
if col.LeftAlign {
fmt.Fprintf(w, "%s%s%s", value, padding, t.ColumnSpacing)
} else {
fmt.Fprintf(w, "%s%s%s", padding, value, t.ColumnSpacing)
}
}
fmt.Fprint(w, "\n")
}
func (t *Table) headerRow() Row {
row := make(Row, len(t.Columns))
for c, col := range t.Columns {
row[c] = col.Header
}
return row
}